Effects of sediment organic carbon on distribution of radiolabeled fluoranthene and PCBs among sediment, interstitial water, and biota

1993 ◽  
Vol 51 (6) ◽  
pp. 873-880 ◽  
Author(s):  
J. M. Brannon ◽  
C. B. Price ◽  
F. J. Reilly ◽  
J. C. Pennington ◽  
V. A. McFarland
Keyword(s):  
Organic Carbon ◽  
Interstitial Water ◽  
Sediment Organic Carbon

Effects of marine pollution, climate, and tidal range on biomass and sediment organic carbon in Chinese mangrove forests

CATENA ◽  
2021 ◽  
Vol 202 ◽  
pp. 105270
Author(s):  
Gang Wang ◽  
Minerva Singh ◽  
Jiaqiu Wang ◽  
Ling Xiao ◽  
Dongsheng Guan
Keyword(s):  
Organic Carbon ◽  
Marine Pollution ◽  
Tidal Range ◽  
Mangrove Forests ◽  
Sediment Organic Carbon

scholarly journals Blooms of cyanobacteria in a temperate Australian lagoon system post and prior to European settlement

2016 ◽  
Vol 13 (12) ◽  
pp. 3677-3686 ◽  
Author(s):  
Perran L. M. Cook ◽  
Miles Jennings ◽  
Daryl P. Holland ◽  
John Beardall ◽  
Christy Briles ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Carbon Content ◽  
Phosphorus Release ◽  
Cyanobacterial Blooms ◽  
Organic Carbon Content ◽  
Lagoon System ◽  
European Settlement ◽  
Current Period ◽  
Sediment Organic Carbon ◽  
Nitrogen Inputs

Abstract. Blooms of noxious N2 fixing cyanobacteria such as Nodularia spumigena are a recurring problem in some estuaries; however, the historic occurrence of such blooms in unclear in many cases. Here we report the results of a palaeoecological study on a temperate Australian lagoon system (the Gippsland Lakes) where we used stable isotopes and pigment biomarkers in dated cores as proxies for eutrophication and blooms of cyanobacteria. Pigment proxies show a clear signal, with an increase in cyanobacterial pigments (echinenone, canthaxanthin and zeaxanthin) in the period coinciding with recent blooms. Another excursion in these proxies was observed prior to the opening of an artificial entrance to the lakes in 1889, which markedly increased the salinity of the Gippsland Lakes. A coincident increase in the sediment organic-carbon content in the period prior to the opening of the artificial entrance suggests that the bottom waters of the lakes were more stratified and hypoxic, which would have led to an increase in the recycling of phosphorus. After the opening of the artificial entrance, there was a  ∼  60-year period with low values for the cyanobacterial proxies as well as a low sediment organic-carbon content suggesting a period of low bloom activity associated with the increased salinity of the lakes. During the 1940s, the current period of re-eutrophication commenced, as indicated by a steadily increasing sediment organic-carbon content and cyanobacterial pigments. We suggest that increasing nitrogen inputs from the catchment led to the return of hypoxia and increased phosphorus release from the sediment, which drove the re-emergence of cyanobacterial blooms.

scholarly journals Spatial Variation in Sediment Organic Carbon Distribution across the Alaskan Beaufort Sea Shelf

Energies ◽  
2017 ◽  
Vol 10 (9) ◽  
pp. 1265 ◽  
Author(s):  
Richard Coffin ◽  
Joseph Smith ◽  
Brandon Yoza ◽  
Thomas Boyd ◽  
Michael Montgomery
Keyword(s):  
Organic Carbon ◽  
Spatial Variation ◽  
Beaufort Sea ◽  
Carbon Distribution ◽  
Sediment Organic Carbon

scholarly journals Effects of temperature, salinity, and sediment organic carbon on methylmercury bioaccumulation in an estuarine amphipod

2019 ◽  
Vol 687 ◽  
pp. 907-916 ◽  
Author(s):  
Amanda N. Curtis ◽  
Kimberly Bourne ◽  
Mark E. Borsuk ◽  
Kate L. Buckman ◽  
Eugene Demidenko ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Sediment Organic Carbon ◽  
Effects Of Temperature ◽  
Methylmercury Bioaccumulation

scholarly journals Bacterial carbon sources in coastal sediments: a cross-system analysis based on stable isotope data of biomarkers

2006 ◽  
Vol 3 (2) ◽  
pp. 175-185 ◽  
Author(s):  
S. Bouillon ◽  
H. T. S. Boschker
Keyword(s):  
Fatty Acids ◽  
Organic Carbon ◽  
Salt Marshes ◽  
System Analysis ◽  
Carbon Sources ◽  
Isotopic Fractionation ◽  
Coastal Sediments ◽  
Large Variability ◽  
Coastal Systems ◽  
Sediment Organic Carbon

Abstract. Coastal ecosystems are typically highly productive, and the sediments in these systems receive organic matter from a variety of local and imported sources. To assess if general patterns are present in the origin of carbon sources for sedimentary bacteria and their relation to the origin of the sediment organic carbon pool, we compiled both literature and new data on δ13C of bacterial biomarkers (the phospholipid derived fatty acids i+a15:0), along with δ13C data on sediment organic carbon (δ13CTOC) and macrophyte biomass from a variety of typical near-coastal systems. These systems included mangroves, salt marshes (both C3 and C4-dominated sites), seagrass beds, and macroalgae-based systems, as well as unvegetated sediments. First, our δ13Ci+a15:0 data showed large variability over the entire range of δ13CTOC, indicating that in many settings, bacteria may depend on carbon derived from various origins. Secondly, systems where local macrophyte production is the major supplier of organic carbon for in situ decomposition are generally limited to organic carbon-rich, peaty sites (TOC>10 wt%), which are likely to make up only a small part of the global area of vegetated coastal systems. These carbon-rich sediments also provided a field based estimate of isotopic fractionation between bacterial carbon sources and biomarkers (-3.7±2.1), which is similar to the expected value of about -3 associated with the biosynthesis of fatty acids. Thirdly, only in systems with low TOC (below ~1 wt%), we consistently found that bacteria were selectively utilizing an isotopically enriched carbon source, which may be root exudates but more likely is derived from microphytobenthos. In other systems with between ~1 and 10 wt% TOC, bacteria appear to show on average little selectivity and δ13Ci+a15:0 data generally follow the δ13CTOC, even in systems where the TOC is a mixture of algal and macrophyte sources that generally are believed to have a very different degradability.

Dinoflagellate cyst abundance is positively correlated to sediment organic carbon in Sydney Harbour and Botany Bay, NSW, Australia

2017 ◽  
Vol 25 (6) ◽  
pp. 5808-5821 ◽  
Author(s):  
Chang Tian ◽  
Martina A. Doblin ◽  
Katherine A. Dafforn ◽  
Emma L. Johnston ◽  
Haiyan Pei ◽  
...  
Keyword(s):  
Organic Carbon ◽  
Dinoflagellate Cyst ◽  
Sediment Organic Carbon ◽  
Sydney Harbour
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